The biggest problem as I see it would be that you need to refocus for each colour. Given the focusing with a CCD or dSLR is annoyingly difficult anyway, spending lots of money on a heavy, computerised focuser that remembers which position it should be in for each colour and at what temperature is probably not worth it. Better to get an APO (or even better a mirror based scope) and not worry about focusing and filtering out chromatic aberration, then you have a great general purpose scope too.
Cheers,
Cam